Using Venn Diagrams, prove that \[ \mathrm{A} \subset \mathrm{B} \Rightarrow \mathrm{A} \cup \ma...

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Using Venn Diagrams, prove that
\[
\mathrm{A} \subset \mathrm{B} \Rightarrow \mathrm{A} \cup \mathrm{B}=\mathrm{B}
\]
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